MBP Turn off LCD when using external display?

I have a new macbook pro laptop. I'm also lucky enough to have a 32 inch lcd HDTV. I'm can connect the two and use front row fine but I'm wondering if there is a way to turn off or put the laptop LCD to sleep when I'm using the HDTV?

The reason I ask this is it is distracting see the output on two displays when you're trying to watch a movie etc. I could turn the laptop and have it face another direction but it would still light up the room; this would also make it difficult to use the remote.

Some of you may mention I could close the lid and use an external keyboard and mouse, my question to you is does this work if you only have a mouse? I have a USB mouse here but no keyboard.

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